Here is the full list of all 22 Event Horizon achievements.
Kill an Enemy
Kill 30 enemies
Start a new game
Return home
Destroy the event
Record all log entries
Record your first log entry
Have four upgrades at once
Get the tool upgrade
Get the slow upgrade
Get the damage over time upgrade
Get the Nexus pull effect upgrade
Get the plasma shot upgrade
Get the final Nexus upgrade
Get grabbed by the trap enemy
Kill 5 Quadravors
Take damage from a false healing plant 3 times.
Kill 10 enemies with the knife
Shoot 100 bullets
Complete the game with full health
Have 3 babies on you at the same time
Get the knockback upgrade